package com.zretc.util;

import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

import sun.misc.BASE64Encoder;

public class Md5 {
	public String EncoderByMd5(String str) throws NoSuchAlgorithmException, UnsupportedEncodingException{
	    //确定计算方法
	    MessageDigest md5=MessageDigest.getInstance("MD5");
	    BASE64Encoder base64en = new BASE64Encoder();
	    //加密后的字符串
	    String newstr=base64en.encode(md5.digest(str.getBytes("utf-8")));
	    return newstr;
	  }
	   
	  /**判断用户密码是否正确
	   *newpasswd 用户输入的密码
	   *oldpasswd 正确密码*/
	  public boolean checkpassword(String newpasswd,String oldpasswd) throws NoSuchAlgorithmException, UnsupportedEncodingException{
	    if(EncoderByMd5(newpasswd).equals(oldpasswd))
	      return true;
	    else
	      return false;
	  }
}
